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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a011916bef820d7009f9f127b8b1a6d3f21cd41d325010aed8624fd741baca73' 
  AND token = 'ikx02xvegdHUb+dvp/Nl/Df7H21Z7f+HMOAgJ/wWqJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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