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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab978165131aee30c28c3d6a0101f814ea2aad0a5a9efb56593ab3f0364dafe' 
  AND token = '8+qohttLiMEPKYa4xpfIPaEE92j3RWkNl3koVFk5db8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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