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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a896619d20a23a3ae1bb22abe65b4c2ae535a067fbcf45b234c74240932bac' 
  AND token = '77r6rY/8xS+3q3Q9CjCNWSoXkcMElnp+DNBxGZ8r9mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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