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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d3e71ff1eaa0f306282a793d226c3d98ffc19fee88e241fe545786649605af' 
  AND token = 'a4RIEG0ayVFLmv7HGLBJ4h1lgR8BKKCA4GktT51mDEU=' 
  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"
    }
  }
}