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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52b76a17a054fd1d0681d5460994f32fd12d19748e319f17720c70437571ae4' 
  AND token = 'tC4u2ppB+/1f119SS6PqGTo1eJS2En3LmSEbRDV4TSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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