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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ce8dbd02552a9d8b80114564810f15ab4e7d1ded4e92d9cf4c93a1d425b02c' 
  AND token = 'sEAPw2nZyYiWcl1brpiK/V6zZCVHVgxfHtxTvbY7D6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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