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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cae0834eada756b9d783a7d0c03c6cd5876593683528f47aaf3859054fbb801' 
  AND token = 'uTLnKvmbzRkhnYw0Au+pLIi5dIX4TNwubnxp+psVNDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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