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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c18321e03c3ac8823f7115b11b4c4f3fcc95bf627e11c703e858b5d913dc1d' 
  AND token = 'j3yxFnXL13uFRfzhBcchaZs3Z7sQi5BbjdSPL3eqFBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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