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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611d94f9f63741184e76d69b1003fd82813d31ce99d8991dc361d7a59269254e' 
  AND token = 'Ybv0LLTWr/Sl4vtTIESX4w5aKC5ImLymPWUqq2vRVsI=' 
  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"
    }
  }
}