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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3998d2d668031bfcb632ef8158bf6c8b29b88cb08cac3a00bbb1e6d8e89f87' 
  AND token = 'agfeyHywL85rcN39gm9M2p4VX33IXBBHu3QXKsErdkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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