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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a44bb6e09b078e07b2b4a1a73640e2eea9756d1bd3b99d9c4e78df0bc9a0fc' 
  AND token = '0CmZqwlcdE+9Uh/UkBb1QsvOpVdOLE4XvscR4yeCElg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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