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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a486a7e26045651b0d326c412847e20faadae8371c56a0a40310a77be3b8cc' 
  AND token = 'AgIOA8ClRJpvk3zN8neMCd98iDusk082t784JNDRlA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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