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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb5bf513dc5ef2ebc2e1599c8ffd6fb4cb682fe15cbd5359b95f9e45b357ca8' 
  AND token = 'ppVtPr4kP2Ni6qzyV0Uru09RnPzFb0mz7vQADp0XMOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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