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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4551dcbde1844c0dfedf48bf34621ff80dfe3eaa94c1b50566516175ee6060' 
  AND token = 'rvdQk/cqMFosqNT3Eo32Mgn0tiypApGvIHA8QO4RNHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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