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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c90d10dd1e093919839af8d5cf8ed06a1a606f8fbd4c6a964d1fb81345e803' 
  AND token = '/j3EcU+vRb3xpK00VoICI+YaP5bm63GcAvSs0OQ8GsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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