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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bad8ca3f1c9cb55e868154c237e0ed88b832de0d81df8b21ed2d3e1ebe1e2d' 
  AND token = 'lTiCks8N1UBswMJIeFM9Zt1jgrdpnEMf1tFBJ4Oyj1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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