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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cd00becde8da95c79cdd5cf031e0a7db0f39dcc8d38326fcc12516aafc6c9c' 
  AND token = 'h1CvPRKi+XNMpkGHU3Aua+N1MaPCrpko+WeIiGzsg8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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