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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fd3741c6403a8c1dbf8188e573fd53965be8ed1d4c80d645a13a74d6dfe1f4' 
  AND token = 'kt8CBn1fL1+Gn6J+2Tfj2p2M8B05o3IO/v+2jHpSohA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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