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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae25326c1e0f93f8b0fcae9b83697a9ea88bb4a0612e1cf11f7c580340d411f' 
  AND token = 'nedz++xPnMtC+6Fcuy2C3RPlkDnZpL1iBzy8LIrlG/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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