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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4ee9d7a7591fef43302ade59ac0222b67329806ad0a326bee54cd743e7c10f' 
  AND token = 'VZC6HELawYNnD4rTIGhml3r9uPfIGfoo1XtELuQu4jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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