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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fa1b70c744a48959d78a6eae1fd6b33e6fd4c44252a1718090d153c111248d' 
  AND token = 'nOy8DSMGTtI07cSGAfxTkzSFVNwu5p5nOfvJ4fVbvs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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