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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124331a22f9963d8904da8393f21be705db538a8b06e29c4dd4a523b89c43762' 
  AND token = 'Ux8Inh5lHM2C12CK8rBMM3XxR3CdGemwgXxLXadPSz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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