SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdea63c6188000fd703e27c6bf18e25d35e5f49c85fb8084a082a097135db97' 
  AND token = '/HlaljqRpPZcrPcLSUwWjlMPtjz/oqQbUCqlF32h2k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables