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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f98275a4ef00115422d758e19fbf4a7e983b279a3717d59be38f450b24a0760' 
  AND token = 'cN6AUrJB6bRGB78CTJ0eRr42sZfpAaZVdY/b9tXm1HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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