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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9112bd23a7d2341ad8608b6fa8199e8c848ed980a99e1316f744e7fda8317f8' 
  AND token = 'b4prKZmBewQQW2YcpS6O5zkx0lCQvMxrmMTVFI1mE8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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