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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa2f23b5f094fc654483237a0821418bb301a012672389c373c4cc2ae89e242' 
  AND token = 'iirk9bA2SYcYJJaKMsW9GCJeM2H5wwyCrQSeM3NpaTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}