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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fdbc5ceedc95cc01c6c7c4f370deb1d2c69f0b0b9f093e09a8cd0c7c0db2bc' 
  AND token = '5Y5bg2jrMKiyfwZF+Fdc6qrAzDmHk7gwvDAriFdQfNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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