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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd312f5f860fb6f3e886bec68b2d83534e5c03c00e7743f9e883882e601144855' 
  AND token = '24hn+lR2ccX7WSKdsPuVi02JO7BTtEuhXJ3Sm+BtMOs=' 
  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"
    }
  }
}