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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe55770c25a97b0d0b261743d3f18ba1d0a5545019e856ed4bf0e67717f43744' 
  AND token = 'Fq6csZ1UcX+YRah0UMwgUOn4E724pCcoybBfwbwjTqs=' 
  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"
    }
  }
}