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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5825262d3b9302fee92779304324847ae38545574e8134d9512404f3b0f24778' 
  AND token = 'Wa9Ok4SyMQoD6HX1hnAdjQylc/zBesxLPF+KuYzirmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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