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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfa18e38a3bd5c25e5d4812c284a4bf847e3baedcc62d3aa3a1708fc8718942' 
  AND token = 'Rq/MoBLiC8lnbTlzKEFClJg3kVk/UeL3zcOs7IdF+oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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