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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880ccc852d4ef21d3ede41a0ab3fc80b7c4bf37a89eb7c498a42613946ec4e1d' 
  AND token = 'zXf04iUnJ/FoRrx4wezzc9Ge03Q/vdk6oTq9ZijluSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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