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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d9f0296c70e5ad34aa4d199786a806251e4d2347b9beb43647fb9cedf8022d' 
  AND token = 'DyPs9uqK+HHcHKfKCTaPz/oyiXQd2K4jidGSnrGOIH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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