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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e9ae5053708b391e82a70bbaec63abf4c1e78672c014084a69d3c0f931d2bb' 
  AND token = 'JA/TKX2gGBcYssV7oWtWTrQ/mKfjy3Y2HU0Etddx6lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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