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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80773d84db6b9c5ab23b72aab6740bbf321d605161e4aa4366738e4afbaf0762' 
  AND token = '4usRIaQb1w+Vn0FK4dc7av+rJgTgCf3xyeyCo6lFhvs=' 
  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"
    }
  }
}