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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110aea6f6388c7dda929c82a1c5de1b8e47aa53f2b1b5aa35c0cdd5a0edbb452' 
  AND token = 'wts6txBq3s+bXwBLwLiutguOMFZUskcM7ru1vcBrmgs=' 
  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"
    }
  }
}