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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b66f9ec5dce2784e599728a253a3b8fe66bb7e68228807a7fdb25bae635c1cf' 
  AND token = 'fs9QOeUmb11QSpaSVgd6+OalWNG3iM9zgzneaX2h644=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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