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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180891539f4f36b00310b68af4be4477002f0e00a4250a2ffa8fcc31cfa3fb65' 
  AND token = 'M69znv7cP/D/m7kE3L0fINuHs8FzW6QiMXj6dMXgjfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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