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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46437d3f08bad6e740e5d1a385fc74b354c07eb9eb21272fd6b3141fe5c44f2f' 
  AND token = 'QcVbjtfb1FZuXxJRLrGZ4DXdkkhJ21qkpy9rfAVBjzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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