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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4a5e7feef9a7b181d63d56ac799d904bb32d3569ad3dbf3c2dd3f6b000a488' 
  AND token = 'Oxed9+BNNIj66+0Ylap+VQ4ZZt6YgPsqtDHliP26HCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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