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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5d7fbfb2dd0db800414f58cab2c90c8f1066d18edb88b16d00baf758d87d96' 
  AND token = 'GRkxPg1AGTKI9wpMfPZVtLtDO/Z8Y5TFMw9kPQ5Dcg4=' 
  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"
    }
  }
}