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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aac59dfb08a1594ef19dece0470f197da6def66e1ad4044f61d332689efe5aa' 
  AND token = 'O5YQUOTIkgq7kSdqjKKuuyuYSExR1j4LfA8YRBpoESs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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