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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f5a2af6fb6951003df36ac26ff28502a3a1f32df40f0b43de8da149850d340' 
  AND token = '7BfOfgpaWPMKo3MFpmzW9QMd1GeUbq8sZBzkxCrylRg=' 
  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"
    }
  }
}