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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42c00b23900556e57cf850d0444ba2782d4681725c2b58e883e42266aff4e5c' 
  AND token = '004NCRTJwkTRhw7iJJO26QnfCfM2/EHSLb4ZKx5YA+o=' 
  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"
    }
  }
}