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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc5bb8d98ce51ec1a33ee75a6e03e76251c2208115f1241c02600f2b6ec00de' 
  AND token = '0R2ZgcZrwywn6RT6jnfvCPy8m8BiaAZXdt2R2JtNdQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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